From: syzbot <syzbot+ab0ad25088673470d2d9@syzkaller.appspotmail.com>
To: kartikey406@gmail.com, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [ocfs2?] KASAN: use-after-free Read in ocfs2_listxattr
Date: Mon, 10 Nov 2025 22:02:02 -0800 [thread overview]
Message-ID: <6912d15a.a70a0220.22f260.0129.GAE@google.com> (raw)
In-Reply-To: <20251111044000.2016410-1-kartikey406@gmail.com>
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in ocfs2_listxattr
On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted.
OCFS2: File system is now read-only.
==================================================================
BUG: KASAN: use-after-free in ocfs2_xattr_get_type fs/ocfs2/ocfs2_fs.h:1114 [inline]
BUG: KASAN: use-after-free in ocfs2_xattr_list_entries fs/ocfs2/xattr.c:934 [inline]
BUG: KASAN: use-after-free in ocfs2_xattr_ibody_list fs/ocfs2/xattr.c:982 [inline]
BUG: KASAN: use-after-free in ocfs2_listxattr+0x408/0xa74 fs/ocfs2/xattr.c:1044
Read of size 1 at addr ffff0000e76a4007 by task syz.0.20/7236
CPU: 1 UID: 0 PID: 7236 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
print_address_description+0xa8/0x238 mm/kasan/report.c:378
print_report+0x68/0x84 mm/kasan/report.c:482
kasan_report+0xb0/0x110 mm/kasan/report.c:595
__asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378
ocfs2_xattr_get_type fs/ocfs2/ocfs2_fs.h:1114 [inline]
ocfs2_xattr_list_entries fs/ocfs2/xattr.c:934 [inline]
ocfs2_xattr_ibody_list fs/ocfs2/xattr.c:982 [inline]
ocfs2_listxattr+0x408/0xa74 fs/ocfs2/xattr.c:1044
vfs_listxattr+0xc0/0x128 fs/xattr.c:493
ovl_listxattr+0xd8/0x49c fs/overlayfs/xattrs.c:123
vfs_listxattr fs/xattr.c:493 [inline]
listxattr+0x10c/0x380 fs/xattr.c:924
filename_listxattr fs/xattr.c:958 [inline]
path_listxattrat+0x15c/0x33c fs/xattr.c:988
__do_sys_listxattr fs/xattr.c:1001 [inline]
__se_sys_listxattr fs/xattr.c:998 [inline]
__arm64_sys_listxattr+0x84/0x98 fs/xattr.c:998
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffb9581 pfn:0x1276a4
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffdffc3a50548 fffffdffc39dab88 0000000000000000
raw: 0000000ffffb9581 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000e76a3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff0000e76a3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000e76a4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff0000e76a4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff0000e76a4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
Tested on:
commit: e424ed99 Merge remote-tracking branch 'will/for-next/p..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=12f30658580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8b659f0cab27b22
dashboard link: https://syzkaller.appspot.com/bug?extid=ab0ad25088673470d2d9
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch: https://syzkaller.appspot.com/x/patch.diff?x=1566f17c580000
next parent reply other threads:[~2025-11-11 6:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20251111044000.2016410-1-kartikey406@gmail.com>
2025-11-11 6:02 ` syzbot [this message]
[not found] <20251117091717.9916-1-kartikey406@gmail.com>
2025-11-17 11:32 ` [syzbot] [ocfs2?] KASAN: use-after-free Read in ocfs2_listxattr syzbot
[not found] <20251111060615.2022366-1-kartikey406@gmail.com>
2025-11-11 7:09 ` syzbot
[not found] <20251111042938.2015551-1-kartikey406@gmail.com>
2025-11-11 5:34 ` syzbot
[not found] <20251111013052.1801231-1-kartikey406@gmail.com>
2025-11-11 3:17 ` syzbot
2025-11-10 18:09 syzbot
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